| CONTINENTAL INVESTIGATION AGENCY | Business | 117000067 | CAROL STREAM | NOT RENEWED | Verify |
| CONTINENTAL INVESTIGATIVE SERVICES LLC | Business | 117001720 | BENTON | ACTIVE | Verify |
| CONTINENTAL PROTECTIVE SERVICES | Business | 122000902 | HINSDALE | CANCELLED | Verify |
| CONTINENTAL SECURITY SERVICES, LTD | Business | 118000104 | CHICAGO | NOT RENEWED | Verify |
| CONTINENTAL SECURITY SERVICES, LTD | Business | 123000113 | WOOD DALE | NOT RENEWED | Verify |
| CONTINENTAL SECURITY SERVICES, LTD | Business | 122000490 | MUNDELEIN | NOT RENEWED | Verify |
| CONTINENTAL SECURITY SERVICES, LTD | Business | 117000566 | MUNDELEIN | NOT RENEWED | Verify |
| CONTRACT BUILDING SERVICES INC | Business | 123000132 | EAST ST LOUIS | NOT RENEWED | Verify |
| CONTRACT BUILDING SERVICES INC | Business | 122000256 | MUNDELEIN | INOPERATIVE | Verify |
| CONTRACT BUILDING SERVICES INC | Business | 122000606 | MUNDELEIN | INOPERATIVE | Verify |
| CONTRACT BUILDING SERVICES INC | Business | 123000133 | CHICAGO | NOT RENEWED | Verify |
| CONTROL SECURITY SYSTEMS INC | Business | 127000705 | SWANSEA | CLOSED | Verify |
| CONTROLLED F.O.R.C.E, INC | Business | 122001511 | BATAVIA | ACTIVE | Verify |
| CONTROLLED F.O.R.C.E, INC | Business | 102000408 | BATAVIA | ACTIVE | Verify |
| CONTROLLED FORCE SECURITY SOLUTIONS LLC | Business | 122001425 | BATAVIA | NOT RENEWED | Verify |
| CONVERGINT TECHNOLOGIES LLC | Business | 127001176 | SCHAUMBURG | ACTIVE | Verify |
| CONVERGINT TECHNOLOGIES LLC | Business | 192000307 | SCHAUMBURG | NOT RENEWED | Verify |
| COOK COUNTY INVESTIGATIONS INC | Business | 102000087 | CHICAGO | ACTIVE | Verify |
| COOK COUNTY INVESTIGATIONS INC | Business | 117000481 | CHICAGO | NOT RENEWED | Verify |
| COOK COUNTY SHERIFF POLICE TRAINING ACA | Business | 201000802 | MAYWOOD | ACTIVE | Verify |
| COPP SECURITY CONSULTANTS LLC | Business | 122001469 | CRYSTAL LAKE | ACTIVE | Verify |
| COPPER SECURITY INC | Business | 127000708 | CHICAGO | NOT RENEWED | Verify |
| COPS INC LOCK AND SAFE TECHNICIANS | Business | 127001043 | PEORIA | ACTIVE | Verify |
| COPS INC LOCK AND SAFE TECHNICIANS | Business | 192000120 | PEORIA | ACTIVE | Verify |
| COPS INCORPORATED | Business | 117000235 | CHICAGO | NOT RENEWED | Verify |
| COPS INCORPORATED | Business | 122000151 | CHICAGO | NOT RENEWED | Verify |
| CORE SECURITY AND INVESTIGATIONS GROUP | Business | 117001643 | CHICAGO | NOT RENEWED | Verify |
| CORE SECURITY AND INVESTIGATIONS GROUP | Business | 122001210 | CHICAGO | NOT RENEWED | Verify |
| CORN BELT BANK | Business | 120000048 | BLOOMINGTON | NOT RENEWED | Verify |
| CORNERSTONE BANK AND TRUST N A | Business | 120500016 | JERSEYVILLE | NOT RENEWED | Verify |
| CORNERSTONE DETENTION PRODUCTS INC | Business | 128000272 | DEKALB | NOT RENEWED | Verify |
| CORNERSTONE PROTECTION & INVESTIGATIONS PLLC | Business | 122001686 | EVERGREEN PARK | ACTIVE | Verify |
| CORNILS SECURITY SYSTEMS | Business | 127000082 | SYCAMORE | NOT RENEWED | Verify |
| CORONA ENTERPRISES | Business | 120100087 | ADDISON | CANCELLED | Verify |
| CORONA SECURITY CORPORATION INC | Business | 122000755 | CHICAGO | NOT RENEWED | Verify |
| CORPORATE ALARM CONNECTION LLC | Business | 127001710 | BELLEVILLE | NOT RENEWED | Verify |
| CORPORATE DETECTIVES INC | Business | 117001051 | SPRINGFIELD | NOT RENEWED | Verify |
| CORPORATE INVESTIGATION & SECURITY SERV CORP | Business | 117001512 | WINFIELD | NOT RENEWED | Verify |
| CORPORATE INVESTIGATION & SECURITY SERV CORP | Business | 122001142 | WINFIELD | NOT RENEWED | Verify |
| CORPORATE INVESTIGATION SERVICES | Business | 102000205 | DOWNERS GROVE | ACTIVE | Verify |
| CORPORATE INVESTIGATION SERVICES INC | Business | 117000897 | DOWNERS GROVE | NOT RENEWED | Verify |
| CORPORATE INVESTIGATION SERVICES INC | Business | 122000707 | DOWNERS GROVE | NOT RENEWED | Verify |
| CORPORATE INVESTIGATIONS & | Business | 117000781 | WORTH | NOT RENEWED | Verify |
| CORPORATE INVESTIGATIVE SOLUTIONS INC | Business | 117001462 | LINCOLNSHIRE | CANCELLED | Verify |
| CORPORATE PROTECTION AND INVESTIGATIVE SERVS INC | Business | 117001208 | ROCKFORD | NOT RENEWED | Verify |
| CORPORATE SECURITY AND PROFESSIONAL SERVICES INC | Business | 117001037 | CHICAGO | NOT RENEWED | Verify |
| CORPORATE SECURITY AND PROFESSIONAL SERVICES INC | Business | 122000796 | CHICAGO | NOT RENEWED | Verify |
| CORPORATE SECURITY CONSULTANTS INC | Business | 122000593 | OAK LAWN | NOT RENEWED | Verify |
| CORPORATE SECURITY INC | Business | 122000148 | SPRINGFIELD | INOPERATIVE | Verify |
| CORPORATE SECURITY INC | Business | 127000049 | CHICAGO | NOT RENEWED | Verify |